Ignition Timing Measuring and Display Device of Internal Combustion Engine

• US 20090133482A1
• Filed: 04/06/2006
• Published: 05/28/2009
• Est. Priority Date: 04/11/2005
• Status: Active Grant

• Current Assignee: Oppama Industry Co., Ltd. (Yamabiko Corporation)
• Original Assignee: Oppama Industry Co., Ltd. (Yamabiko Corporation)
• Inventors: Kawahara, Atsushi, Takano, Toshiyuki, Matsuda, Fumitake, Iwata, Masao
• Granted Patent: US 7,726,181 B2
• Time in Patent Office: Days
• US Class Current: 73/114.630
• CPC Class Codes: F02D 41/009 using means for generating position or synchronisation signals
• CPC Class Codes: F02P 17/02 Checking or adjusting ignition timing
• CPC Class Codes: F02P 17/12 Testing characteristics of the spark, ignition voltage or current testing of sparking plugs H01T13/60
• CPC Class Codes: F02P 2017/003 using an inductive sensor, e.g. trigger tongs

Abstract

An ignition timing measuring and display device of an internal combustion engine (1) having a magneto (A) includes a reference RPM signal pulse detector (2) for detecting a reference RPM signal pulse of the internal combustion engine (1) and an ignition noise pulse detector (4) for detecting ignition noise of an electromagnetic wave generated in the vicinity of an ignition plug (3) when ignition is carried out in the internal combustion engine (1) and calculates ignition timing generated by the magneto (A) based on the signal pulse and the ignition noise pulse and displays it. Since the ignition timing of the internal combustion engine can be easily monitored, maintenance can be carried out to the internal combustion engine and an ignition device to realize a necessary operating performance of the internal combustion engine.

Claims

1. An ignition timing measuring and display device of an internal combustion engine having a magneto, characterized by comprising:

a reference RPM signal pulse detector for detecting a reference RPM signal pulse of the internal combustion engine; and

an ignition noise pulse detector for detecting ignition noise of an electromagnetic wave generated in the vicinity of an ignition plug when ignition is carried out in the internal combustion engine,

wherein ignition timing generated by the magneto can be subjected to an arithmetic operation based on the signal pulse and the ignition noise pulse and displayed.

2. An ignition timing measuring and display device of an internal combustion engine according to claim 1, characterized in that the reference RPM signal pulse of the internal combustion engine is a voltage pulse induced by a generator coil of the magneto.

3. An ignition timing measuring and display device of an internal combustion engine according to claim 1, characterized in that the reference RPM signal pulse of the internal combustion engine is a voltage pulse induced to a primary coil of an ignition coil of the magneto.

4. An ignition timing measuring and display device of an internal combustion engine according to claim 1, characterized in that the reference RPM signal pulse of the internal combustion engine is an output pulse of an optical sensor, a magnetic sensor, and the like for detecting RPM of the internal combustion engine.

5. An ignition timing measuring and display device of an internal combustion engine according to claim 1, characterized in that, in the arithmetic operation of the ignition timing, time T per reference angle is determined from a cycle T1 of the reference RPM signal pulse, and a value obtained by dividing a time T2, which passed from the time at which the signal pulse was generated to the time at which the ignition noise pulse of the electromagnetic wave was generated for the first time after the signal pulse was generated, by the time is determined as ignition timing.

6. An ignition timing measuring and display device of an internal combustion engine according to claim 1, characterized in that a constant corresponding to ignition timing inherent to an internal combustion engine which is different in each of work machines is set, and ignition timing determined by the arithmetic operation based on the set constant is displayed.